There seems to be a day for breaking every bad habit. For example, today is “World No Tobacco Day.” Having one special day can be good for awareness campaigns. Actually changing habits takes much longer.
The reason we call habits “bad” is because they are working against some other goal we have. Our habits might be bad for our health, or take time away from more important things. The trick is not to focus on the habit you don’t want, but instead focus on the better result you do want.